题干
– _______ that made Mrs. White so upset?
– Her son’s making trouble in the school.
– Her son’s making trouble in the school.
A：Where was it
B：Why was it
C：How was it
D：What was it
答案(点此获取答案解析）
D
CO2+H2在800℃达到平衡时分别改变下列条件，K值发生变化的是（ ）